abstract
Commercial success of algal-based biofuels depends on growth characteristics and lipid metabolism of
the production species. The oleaginous microalgae, Thalassiosira pseudonana, Odontella aurita, Nannochloropsis oculata, Isochrysis galbana, Chromulina ochromonoides, and Dunaliella tertiolecta, were cultivatedunder a matrix of two temperatures (10 and 20 °C) and two nutrient regimes (deplete and replete).
For all species, a strong negative correlation between growth rate and lipid content was observed. Multiple stressors have no additive effect on lipid accumulation. Total oil content (fatty acid methyl esters,
FAMEs, pg cellÀ1) was increased more by nutrient limitation than by temperature stress. Inresponse
to nutrient stress, N. oculata emerged as the most robust species with an increase in lipid accumulation
of up to three to four-fold compared to the accumulation under nutrient sufﬁcient conditions. Although
stress conditions led to reduced fatty acid unsaturation in most taxa due to increased triacylglycerol
(TAG) production, a high proportion of eicosapentaenoic acid (EPA) wasmaintained in O. aurita.
Ó 2012 Elsevier Ltd. All rights reserved.

a wide range of environmental conditions with, in many cases,
short doubling times (Mata et al., 2010). Furthermore, their survival
strategies are often underpinned by the presence ofdiverse and
unusual patterns of cellular lipids and their capacity to modify lipid
metabolism in response to changes in environmental conditions.
Both biomass production and lipid accumulation are limited by a
variety of factors, of which nutrients (e.g. Chen et al., 2011; Feng
et al., 2011; Mairet et al., 2011), temperature (Fuentes-Grünewald
et al., 2012; Li et al., 2011a) and irradiance(Hu et al., 2008 and

...carbon credits and swine production: an analysis of projects and regions of Brazil 2011
Abstract
By Brazilian Institute of Geography and Statistics (IBGE) growth in the swine herd and milk production in Brazil in 2009. The disclosure, made by the agency in Rio de Janeiro, indicates an increase in other products. The milk has reached 29.112...

...School and the Productionof Society
ANDRÉ PETITAT, Department of Sociology, University of Québec-Montreal
ABSTRACT Most sociological theories present school as a source and a channel of social reproduction: of a dominant group, of essential values, of bureaucracy, etc. This paper, primarily based on a study of the origins...

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